Is the following call to VistorIndentification()
still required within Sitecore 8 MVC layouts / views?
@using Sitecore.Mvc.Analytics.Extensions
@Html.Sitecore().VisitorIdentification()
Even without it, page visits appeared to be tracked in Tracker.Current.Contact.System.VisitCount and within the Experience Profile information.
What feature or tracking ability is dependant on this?
I don't think your site will break without it, but I would highly recommend adding it in for full xDB support. Without it, I believe all your traffic may be treated as a 'robot' and will not get tracked. A few articles referencing using the visitor identification:
http://www.daveleigh.co.uk/sitecore-7-5-mvc-enabling-analytics-xdb/ http://www.daveleigh.co.uk/sitecore-xdb-and-setting-up-mongo-replica-sets/